PLATE 3 



EXPLANATION OF FIGURES 



1 to 5, 7 to 9 Polar views of spermatogonia! metaphase complexes. 1 to 7 

 are of Hesperotettix viridis, 8 of H. brevipennis and 9 of H. speciosus. 



1, is of class 2, showing twenty-two chromosomes, of which one is a multiple. 

 The accessory chromosome portion of this is marked '^.' 



2 An example of class 3. The members of the large first spermatocyte 

 euchromosome multiple ring are the larger V-shaped elements, while the smaller 

 V includes the accessory portion of the hexad. Twenty separate chromosomes. 



3 A complex of class 4, in which the largest two V's are parts of the first 

 spermatocyte ring, the next largest one of the octad V, and the smallest of the 

 hexad. Nineteen separate chromosomes. 



4 In this group, representing class 5, there are three V's belonging to two 

 octads of the first spermatocyte, the smaller of which is a V. The accessory 

 chromosome is free. Twenty separate chromosomes. 



5 From an individual of class 6 with a frep accessory chromosome and one 

 octad ring in the first spermatocyte. Twenty-one chromosomes. 



6 An anaphase group of class 4 showing the 4 V's (fig. 3 above). 



7 A complex of class 6 in which the octad of the first spermatocyte is a V 

 instead of a ring. The one V in this spermatogonial group is involved in the 

 formation of this multiple. Twenty-two free chromosomes. 



8 From H. brevipennis in which all specimens studied showed twenty-three 

 rod shaped chromosomes. 



9 The one V in this complex of twenty-two chromosomes will constitute a 

 part of the hexad in the first spermatocyte. The accessory chromosome forms 

 one limb. 



10 An octad ring of H. viridis in the late prophase. It will commence to 

 separate at the apex. 



11 Late prophase condition of such a chromosome as shown in figure 10. 



12 Shows metaphase condition of such octad rings. These are from dif- 

 ferent cells. 



13 Two metaphase octad rings of H. viridis from the same cell. Class 5. 



14 Similar elements from another cell of the same individual as shown in 

 figure 13. The large octad b has one tetrad forming a ring lying in. the equatorial 

 plate at right angles to the other member. The small octad a shown edgewise. 



15 Five examples of the V-shaped octad of class 4. The inequality of the 

 constituent tetrads shows clearly. 



16 Multiples of class 4; a the large octad and the hexad; c the two octads, the 

 larger like figure 14 b. 



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